subject: Hardware Knowledge: Crankshaft Ablation Causes And Countermeasures - Hardware, Crankshaft, Bearings [print this page] Crankshaft ablation causes and countermeasures: crankshaft erosion, mainly by the crankshaft journal and bearing oil film between the failure to form an effective, making the crankshaft journal and bearing a direct result of friction. When the engine crankshaft erosion occurs, it will run the white smoke issuing different metal impact sound, and even lead to the crankshaft and the bearing can not rotate with the locking. Must therefore be the cause of their failure to correctly analyze and judge.
1, poor quality oil: 1) poor quality oil. Use of oil quality and viscosity grade levels lower, or different grades were mixed in the oil, resulting in the use of performance below standard oil; oil mixing process of using a lot of dust and diesel engine operating temperature is too high due to oil oxidation to metamorphism. Oxidative deterioration of oil was black, dull, the concentration increased, with two fingers, twist the oil, oil feel there are dust and other impurities. If it is found above the present situation with oil, it must change in time. 2) oil thinning. As part of the diesel engine fuel injection pump lubrication way with pressure lubrication, and lubricants Road, once the fuel pump seal failure. Diesel oil into the oil chamber, will dilute the engine oil deterioration. In addition, Flow set trachoma cracks or holes in the cooling water to seep into the oil will make oil thinning. Diesel can check the upper part (cylinder heads on the plane, valve bodies, cylinder head casing) whether water vapor or droplets. If found to increase the use of oil capacity, decreased concentration, viscosity reduction, and their remaining greasy oil is illustrated in the mixed diesel. Import Valve Door
2, not enough oil stocks, oil pressure is lower: oil is not enough stock, low oil pressure, will result in inadequate flow of diesel engine lubrication oil, and then can not guarantee crankshaft journal and bearing lubricant between the films. Can check the amount of oil within the oil pan and oil pressure gauge readings, and further checks whether the oil pipeline blockage, leakage and other anomalies.
3, the crankshaft journal and bearing clearance is too big or too small: 1) crankshaft journal and bearing too much for space, resulting in low engine oil pressure, can not form a sufficient oil film. 2) the crankshaft journal and bearing is too small because of space, between the crankshaft journal and bearing oil film thickness is not enough or no films. When the gap is too large or too hours available Micrometer , Volume cylinder table check journal, Bearing Hole, bearing size, calculated with the gap, can also be directly measured with feeler gap.
4, crankshaft or cylinder geometry of super-difference: 1) a larger crankshaft radial runout tolerance, so that journal and the bearing clearance of small or no gap, inadequate lubrication or no lubrication film. 2) The cylinder block main bearing bore concentricity tolerance, resulting in neck and shaft bearing gap is too small or no gap, inadequate lubrication or no lubrication film. 3) The cylinder and main bearing bore perpendicularity tolerance, resulting in rod journal, spindle neck gap is too small or no gap, inadequate lubrication or no lubrication film. Overhauled in the new machines or diesel engines in use will not be long in the case, often forming the phenomenon. Determine the geometry of tolerance parts can first hand shake to switch to diesel crankshaft (rotary effort), and then by pine-cylinder diesel engine main bearing cap and unloading rod bearing cap, then turn the crankshaft. According to the size of the rotating crankshaft torque, change to specify different (but the difference to determine the size of super, you need to disintegration of diesel engines, with special submit content).
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